Gasoline tank cap attachment



FIG. 1 is a diagrammatic perspective view of the gasoline tank cap attachment;

FIG. 2 is a front elevational view thereof, the rear elevational view being a mirror image of the front view;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a left side elevational view of the gasoline tank cap attachment;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a gasoline tank cap attachment, as shown and described. 